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Medical Claims Liability - Schedule of Change in Medical Claims Liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1 $ 18,000 $ 16,745 $ 14,243
Less: Reinsurance recoverables 49 26 23
Balance, January 1, net 17,951 16,719 14,220
Acquisitions and divestitures     105
Incurred related to:      
Current year 128,312 120,680 112,896
Prior years (2,447) (2,036) (1,367)
Total incurred 125,865 118,644 111,529
Paid related to:      
Current year 111,456 104,725 97,799
Prior years 13,959 12,937 11,336
Total paid 125,415 117,662 109,135
Plus: Premium deficiency reserve (158) 250  
Balance December 31, net 18,243 17,951 16,719
Plus: Reinsurance recoverables 65 49 26
Balance, December 31 18,308 18,000 16,745
Medicaid      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1 10,814 11,253 9,845
Less: Reinsurance recoverables 5 7 23
Balance, January 1, net 10,809 11,246 9,822
Acquisitions and divestitures     0
Incurred related to:      
Current year 78,886 79,747 76,344
Prior years (1,370) (1,537) (1,046)
Total incurred 77,516 78,210 75,298
Paid related to:      
Current year 69,351 69,904 66,221
Prior years 8,693 8,743 7,653
Total paid 78,044 78,647 73,874
Balance December 31, net 10,281 10,809 11,246
Plus: Reinsurance recoverables 18 5 7
Balance, December 31 10,299 10,814 11,253
Medicare      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1 3,612 3,431 2,286
Less: Reinsurance recoverables 0 0 0
Balance, January 1, net 3,612 3,431 2,286
Acquisitions and divestitures     0
Incurred related to:      
Current year 21,170 19,487 19,474
Prior years (575) (343) (102)
Total incurred 20,595 19,144 19,372
Paid related to:      
Current year 18,036 16,631 16,275
Prior years 2,655 2,582 1,952
Total paid 20,691 19,213 18,227
Plus: Premium deficiency reserve (158) 250  
Balance December 31, net 3,358 3,612 3,431
Plus: Reinsurance recoverables 0 0 0
Balance, December 31 3,358 3,612 3,431
Commercial      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1 3,460 1,921 2,014
Less: Reinsurance recoverables 44 19 0
Balance, January 1, net 3,416 1,902 2,014
Acquisitions and divestitures     0
Incurred related to:      
Current year 26,548 19,966 14,296
Prior years (509) (150) (204)
Total incurred 26,039 19,816 14,092
Paid related to:      
Current year 22,547 16,823 12,556
Prior years 2,492 1,479 1,648
Total paid 25,039 18,302 14,204
Balance December 31, net 4,416 3,416 1,902
Plus: Reinsurance recoverables 47 44 19
Balance, December 31 4,463 3,460 1,921
Other      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1 114 140 98
Less: Reinsurance recoverables 0 0 0
Balance, January 1, net 114 140 98
Acquisitions and divestitures     105
Incurred related to:      
Current year 1,708 1,480 2,782
Prior years 7 (6) (15)
Total incurred 1,715 1,474 2,767
Paid related to:      
Current year 1,522 1,367 2,747
Prior years 119 133 83
Total paid 1,641 1,500 2,830
Balance December 31, net 188 114 140
Plus: Reinsurance recoverables 0 0 0
Balance, December 31 $ 188 $ 114 $ 140